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周日变动
1、diurnal equinox───昼夜分点
2、fluctuation law───波动规律
3、diurnal───n.日记账；日报，日刊；adj.白天的；每日的，一日间的
4、diurnal rhythm───昼间节率；[生理]昼夜节律
5、diurnal moths───昼蛾
6、fluctuation means───波动意味着
7、diurnal rhythms───昼间节率；[生理]昼夜节律
8、price fluctuation───[物价]价格起伏，物价波动；价格变动，价格波动
9、diurnal seizure───日间发作
1、The results showed that the diurnal fluctuation of temperature and humidity had similar tendency between inside and outside of greenhouse under different weather conditions.───结果表明，不同的天气条件下，温室内外的温度和湿度的日变化趋势比较一致。
2、cloudy day, however, the diurnal fluctuation and the vertical distribution of non-ionized ammonia concentration at different water depth have little difference.───大风天气，分子氨含量昼夜变化明显，但垂直分布差别不大。
3、Meanwhile, a diurnal fluctuation in indoor radon concentration was observed.───高温低湿环境有利于氡进入温室且浓度呈日间周期性波动。
4、diurnal fluctuation in indoor radon concentration was observed.───低湿环境有利于氡进入温室且浓度呈日间周期性波动。